Sonomak

Just browsing around Neopets - as you do - and I saw my Ylana's Blaster up for trade. Funny, considering it wasn't me.
I'm sure someone is in my account, what do I do? I've changed my password twice. I've just read about "CG" - what's that? I have no clue, I haven't gone onto any external sites or anything.

Help apreciated asap.